Composite sandwich with improved ballistic toughness

US20060093847A1Inactive Publication Date: 2006-05-04UNITED TECH CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
UNITED TECH CORP
Publication Date
2006-05-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

A composite structure having improved ballistic toughness and suitable for use in a fan containment case is provided. The composite structure includes a plurality of core layers, a plurality of inner plies position between adjacent ones of the core layers, each of the inner plies being formed from an organic matrix composite, an inner skin located adjacent an innermost one of the core layers, and an outer skin located adjacent an outermost one of the core layers. In a preferred embodiment, the core layers are formed from a honeycomb material made from aluminum or an aluminum alloy.
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to gas turbine engines, and, more particularly to a composite structure within the fan region for containing released blade fragments of a gas turbine engine.

[0002] Gas turbine engines have large fans at the forward end that rotate at high speeds. If a fan blade fails and is released the fragments become high-energy projectiles. These fragments can weigh as much as seven kilograms and can travel at speeds about 9.30 meters per second. It is critical to contain these blade fragments and to retain the structural integrity of the casing that surrounds the fan and its blades.

[0003] A typical containment structure is shown in U.S. Pat. No. 4,490,092 to Premont. A support structure has “C” shaped stiffeners between inner and outer shrouds. This structure surrounds the fan and has multiple layers of woven KEVLAR ballistic fabric. This fabric is wound under tension and serves to resiliently contain blade fragments passing th...

Claims

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